Institution: | International Rice Research Institute, P O Box 933, 1099 Manila, The Philippines;Centre for Agrobiological Research, P O Box 14, 6700 AK Wageningen, The Netherlands;Agriculture Canada, Research Station Harrow, Ontario, Canada NOR 1G0;Department of Theoretical Production Ecology, Wageningen Agricultural University, P O Box 430, 6700 AK Wageningen, The Netherlands |